High-Performance™ Low-E4™ Glass

Renewal by Andersen introduces High-Performance™ Low-E4T™ Glass, the next generation of energy-efficient, low-maintenance glass, and further advances Andersen's proven glass technology.

Fewer Water Spots and Easier Cleaning

New Low-E4 glass features an innovative titanium dioxide (TiO²) exterior coating, which makes cleaning easier. When this coating is activated by sunlight, dirt loosens from the glass and can be washed away by rain. The special TiO² coating also makes the glass dry faster with up to 99% fewer water spots*.

Adds Thermal Protection

Andersen Low-E4 glass employs a hermetically-sealed system for optimum insulation from heat, cold and sound. A patented low-conductivity spacer separates the two panes of glass. The space between the two panes is filled with an argon gas blend to minimize the thermal transfer. Compared to ordinary dual-pane glass, High-Performance Low-E4 glass is 41% more energy-efficient in summer and 35% more efficient in winter. Depending on where you live, that can cut your energy bills up to 25%**.

Helps Keep UV Rays Outside

High-Performance Low-E4 glass works like a sun block to filter ultraviolet (UV) rays that can fade fabric and damage furniture. Ordinary dual-pane glass lets 63% of UV light pass through. High-Performance Low-E4 glass is layered with 11 microscopic coatings that cut UV transmission down to 17% with virtually no effect on the clarity or color of the light that enters your home.

Reduces Sound Penetration

In addition, High-Performance Low-E4 glass also reduces sound penetration significantly, even when compared to single-pane glass.

Standard Feature

Low-E4 glass is exclusive to select Andersen® windows and doors, and is included as a standard feature on all Renewal by Andersen® window products.

*On exterior surface when activated by sunlight.
**A study of identical homes comparing Low-E4T glass to ordinary dual-pane glass showed a 25% savings on cooling bills, 10% on heating. Savings may vary.

Renewal by Anderson offers three glass performance options

Each glass option provides a varying degree of four unique benefits for heating, cooling, visible light transmittance and ultra violet (UV) protection. The right glass solution for you depends on the climate you live in, the architectural design of your home, the orientation of yours windows to the sun, and the "custom climate" you desire in the home. On all glass exteriors, special coatings are applied to reduce water spotting up to 99% when activated by sunlight.

High-Perfomance™ Low-E4® glass is our standard offering. Compared to ordinary dual-pane glass, High-Performance™ Low-E4® glass is 45% more energy-efficient in winter and 56% more efficient in summer**. Depending on where you live, that can cut your energy bills up to 25%.888 High-Performance™ Low-E4® glass blocks 84% of harmful UV rays.

High-Performance™ Low-E4® SmartSun™ glass is the most energy-efficient glass option we have ever offered. Compared to ordinary dual-pane glass, High-Performance™ Low-E4® SmartSun™ glass is 45% more energy-efficient in winter and 70% more efficient in summer. It has our highest efficiency rating in cool weather and is exceptional in hot climates where solar heat gain can lead to excessive air conditioning expense. SmartSun™ glass blocks the sun's heat, while letting in almost as much natural daylight as clear glass, reducing your need for artificial lighting. What's more, SmartSun™ glass blocks an amazing 95% of harmful UV rays which helps reduce fading on your carpet, drapes, artwork and furniture but has virtually no effect on the clarity or color of the light that enters your home.

High-Performance™ Low-E4® Sun™ glass offers our highest rating against solar heat gain coming through your glass, helping keep your home cooler in warm weather. Our sun glass has a tint coating, reducing the amount of visible light and sunshine streaming in from too bright to just right!